Isolation Testing

Backflow isolation testing is a critical procedure used to protect drinking water systems from contamination caused by backflow—when water flows in the reverse direction due to pressure changes. Isolation testing focuses on individual backflow prevention assemblies installed on specific equipment or processes (such as irrigation systems, fire lines, or commercial machinery), rather than the entire property.

During the test, a certified technician uses calibrated test gauges to verify that each internal check valve and relief component within the backflow device is functioning properly. The process confirms that the device can effectively prevent contaminated water from entering the potable water supply under backpressure or back siphonage conditions.

Regular backflow isolation testing is typically required by local water authorities and must be documented annually or after repairs or installation. Passing the test helps ensure regulatory compliance, protects public health, and reduces the risk of cross-connection contamination. If a device fails, repairs or replacement must be completed and retested to restore compliance and maintain safe water quality.

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